Alternanthera brasiliana, also known as large purple alternanthera, metal weed, bloodleaf, parrot leaf, ruby leaf, Brazilian joyweed, purple alternanthera, purple joyweed, is a flowering plant of the amaranth family that is native to the forests of South America and as well as Central America, ranging from northeastern Mexico to northeastern Argentina. It is grown as an ornamental plant.

Alternanthera brasiliana var. villosa, a variety known as little ruby or ruby leaf alternanthera, is also known by the synonym Alternanthera dentata.

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